This brush is made with a mixture of Thunderon®, a conductive filament, and Goat hair. Thunderon® is a very fine (0.0015 diameter) acrylic fiber chemically bonded with copper sulfide. The special fiber will dissipate a charge on any electrically charged surface. The surface resistivity of Thunderon® is 10-2Ω/cm. The plastic handle is dissipative with a surface resistivity of 105Ω/cm.